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Ampegs can be divided into six distinct groups for dating purposes: pre-1953, 1953 to mid-1965, early 1965 to 1969, 1969 to 1979, 1981 to 1984, and post-1984.
See the explanation for serial number 980311301 below: 980311301 First two digits indicate the year - 98 (1998) 980311301 3rd & 4th digits indicate the two-digit month - 03 (March) 980311301 5th & 6th digit indicate the day - 11 (the 11th) 980311301 7th digit is a series code number - 0 for 300 or 400 Series, 1 for 500 through Presentation Series, 2 for 200 Series, 3 for a Baby, 4 for a Big Baby, 5 for a T5, 7 for Nylon Series, 8 for 100 Series, and 9 for Solid Body Series. 980311301 Last two digits indicate the guitar's position in that day's production sequence.
11-Digit Serial Numbers January 2000 - October 2009, the serial number expanded from 9 to 11 digits to accommodate the four-digit year designation.
put serial numbers on almost all of its keys, except a few early production runs.These codes can be found on speakers, transformers, pots, capacitors, and multi-section electrolytic "can" caps.Of course, these codes are only applicable to original components, not replacement parts.Starting in 1990, John compiled his list from a survey of more than 3000 Vibroplexes, their serial numbers, and the date they were purchased, if known.Owners should apply some common sense to the information in John’s document.